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Applied by referral. Three months later, I had an interview. The interview was easy, and the interviewer helped me through it. I became cocky and too confident, and I didn't use the tips given by my interviewer.

A recruiter contacted me by email and asked me to do a phone interview. She asked me whether I was familiar with a production engineer's work and 10+ initial screen questions. They were all about basic Linux and networking knowledge, like port number

The interviewer seemed extremely disinterested and really put me off. It did not seem like they even wanted to interview me. At times, they were even rude. I hope that this doesn't happen to you.